Integrated: 8333382: [s390x] Enhance popcnt Instruction to use Z15 facilities

[Amit Kumar]

On Sat, 1 Jun 2024 13:15:45 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> We need to move popcnt instruction implementation out of s390.ad file as it is required to be required some methods present in [JDK-8331126.](https://bugs.openjdk.org/browse/JDK-8331126)
> 
> 
> When the miscellaneous-instruction-extensions facility 3 is not installed or bit 0 of the M3
>  field is zero, a count of the number of one bits in each of the eight bytes of general register
>  R2 is placed into the corresponding byte of general register R1. Each byte of general register 
> R1 is an 8-bit binary integer in the range of 0-8.
> 
> 
> 
> When the miscellaneous-instruction-extensions facility 3 is installed and bit 0 of the M3 field
> is one, a count of the total number of one bits in the 64-bit general register R2 is placed into 
> general register R1. The result is a 64-bit unsigned integer in the range 0 to 64.
> 
> 
> Performed tier1 test on fastdebug build and didn't see any regression.

This pull request has now been integrated.

Changeset: 5a8a9fdf
Author:    Amit Kumar <amitkumar at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/5a8a9fdfa599e8939a5c6675883a92c869474979
Stats:     228 lines in 6 files changed: 199 ins; 21 del; 8 mod

8333382: [s390x] Enhance popcnt Instruction to use Z15 facilities

Reviewed-by: lucy, aph

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PR: https://git.openjdk.org/jdk/pull/19509